Hi, im new to the electronics side, but i have a 12v input from a laser trigger via a relay and need to output 3.3v. I've seen somewhere else that i need a 470 ohms resistor (colour band Yellow Violet Brown Gold) they have turned up today and the 12.24v in and the other side of the resistor is stil…

You need a voltage regulator module .

brilliant, thanks. will try find one from a UK supplier :slight_smile:

If you do not need your circuit to supply much current, then you could use a simple voltage divider . Is the 3.3V just needed for a logic level input (in which case a voltage divider will suffice), or are you using it to power something? (if that is the case, then jremington's solution would be pref…

bowen73: Hi, im new to the electronics side, but i have a 12v input from a laser trigger via a relay and need to output 3.3v. I've seen somewhere else that i need a 470 ohms resistor (colour band Yellow Violet Brown Gold) they have turned up today and the 12.24v in and the other side of the resis…

Def dont use a resistor between 12v and an input pin rated for only 3.3 or 5v....sure it limits current but what youre really doing is pull an input pin up to a 12v rail which would most likely break something!!! Divider or regulator is the way to go depending why youre needing the 3.3

dcrash36: what youre really doing is pull an input pin up to a 12v rail which would most likely break something!!! The input protection diodes clamp the input voltage to VCC+0.65volt, so no 12volt on the input. This Atmel application document connects 230volt AC on an input pin through a curren…

What the guy needs it either (... question is not clear enough): a voltage regulator (post #2 in this thread) - when he wants to supply a voltage to a circuit a voltage divider using two resistors - when he wants to reduce the input voltage for an Arduino input pin Who ever talked about 230…

arduinoaleman: Who ever talked about 230 Volts?? And when you follow the link, you will end up with a discription of a Zero-Crossing-Detection device. I think he was using it to make the point that you can put a much larger voltage on an input pin without damaging it.

If you want to pull much current at 3.3V from 12V, get a 90+% efficient DC-DC buck converter rated for twice what you want. A 3A output adjustable might cost about $2 on eBay. More amps, more cost.

reducing 12v to 3.3v ?

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reducing 12v to 3.3v ?

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